Shock-absorber.



G. F. BOIDOT.

SHOCK ABSORBER. APPLICATION FILED 111mm, 1913,

,gf Patented 11611.24, 1914.

@mmm

c. P. BOIDOT.

SHOCK ABSORBBR. APPLICATION IILD APR.19, 1913.

:Lz mmm Feb. 24, 1914:.

2 SHEETS-SHEET 2.

Q l -1 @2% Wm CHARLES BOIDOT, OF CHICAGO, ILLINOIS.

SHOCK-ABSORBER.

Losetas.

Specification of Letters Patent.

hpplicationled April 19, 1913. Serial No. 762,291.

To all whom 'it may concern:

Be it known that I, CHARLESF. Boino'r, a citizen 'of France, residing at Edgewater', Chicago, in the county of Cook .and State ot 5 Illinois, have invent-ed new and useful lmprovements'iii Shock-bsorbers, of whichr the following is a specification.

r1`his invention relates toshock absorbers@ the object in view being to provide a simple, como pact and effective device of the class described which is adapted foruse on anywehicle in which the body is supported'relatively to the axles by meansof springs, the shock absorbing device being` designed and adapted to absorb all ordinary road shocks to which the wheels, axles, and axle springs are subjected, preventing'the transmission of such shocks to the body of the lvehicle, adding materially to the comfortof the occupantsof the Ve hicle andthe life and durability of the Vehicle as a whole.

. JV-ith the above and other objects in View. the invention consists in the construction, combination and arrangement of parts, as will be hereinafter more fully' described, illustrated in the vaccompanying drawings, and pointed out in the claims hereunto appended.

l-n the drawings: 4Figure 1 is a side elevation, showing one of the shock absorbers of this invention applied toa motor vehicle, ysuch as an automobile. Fig 2 is a`v central longitudinal section Athrough the shock absorber. Fig. 3 is a'dianietrical longitudinal section taken at right angles to Fig. 2. Fig. a is a section on theline 4-4 of'Fi'g. 2. l Fig. 5 is a vertical section through the shock absorber ,showing another arrangement ot springs andl seat. all) invention has a general cylindrical shape, as

shownin F ig, l, and in the preferred einbodiment thereof, the frame of the shock absorber comprises an upper head 1, a lower t5 head 2, and a cylindrical casing Bwhich is held between annular -flanges 4 and 5 on the `adjacent faces of the top and bottom heads 1 and 2, the heads and casing being held together .in fixed relation by means of tie bolts I 5@ 6 which pass through holes'. in both heads and are secured by nuts?. This provides a practically dust-proof casing, in which .the

shoclrfabsorbing springs, hereinafter particu lar'ly'described, are inciosed. Y

ml .it bottom plate 2 is supported from the top'head 1 'by means ot a centrally located The shock absorber contemplated inthisl bolt 8 which extends through openings in both otsaidl members 1 and 2, and has its lower end threaded -to receive a nut 9 which bears against the bottom or the bottom plate 2', as shown. l

Extending up'wzudly :from the upper head 1 are two armsjlOari-anged in spaced relation to each other, as shown, a spring retain; iiig 'bolt 12 extending through saidarms and being fastened by means of a nut l2', 13V designating one end of the body spring which is providedwith aneye 14, through whichthe bolt l2passes, thus forming a connection be tween the body spring and the body or frame of the shock, absorber'. The arms 10 are shown as extending upwardly from a connecting base 15, through which the bolt 8 Patented Feb. 2d, 1914.

' 17 designatesthe axle spring which is provided at one end 'with an eye 18, through which passes a bolt 19, said boli. also passing through a pair of blocks 20 arranged in holes formed in and extending lengthwise ot' the arms l0, and also through the upper head 1 of the casing, the lower extremities oil said bolts being provided with L-shaped heads 23 extending laterally and radially outwardly, for a purpose which will hereinafter appear.

A24 designates a spring holding seat'or cup in the form-of a hollow cylinder provided at its upper edge with an outwardly extending -circuinferential 'flange 25, the outer edge of `which rides in Contact with or in close proximity to the :innersurface of the casing or shell 3. The liange Q5 is provided with a number or openings corresponding with the number of bolts 21, through which said 4bolts pass and are adapted to slide under i Housed -within the cup or seat 24 is the lower end portion of an expansion or ccmpression spring 28, the upperl portion of which is contained between the bolts 21, and the upper extremity of which bears against the under side of the top head l. Another expansion or compression spring 29 of larger diameter encircles the bolts 21, just inside-of the casing 3, the upper end of said spring bearing against the bottom of the top'A head1, and the lower end of said spring nding its support on the flange 25 of the cup -or seatI 24.

Another coiled expansion spring 30 encircles the cup o r seat 24 bearing at its upper end against the bolt heads 23,.and at its lower end against the bottom plate 2.v

The weight of the -vehicle'and its load is borne by the springs 28 and '29 which serve to absorb the ordinary road shocks, to which a vvehicle is subjected, while the sprin 30 is designed to .take Vup'the rebound o the body in the upward movement" or thrust thereof, as the springs 28 and 29 quicklyvexf pand after being compressed by the load being thrown thereon. The shock caused bythe rebound or upward movement of the vebicle body is often'more disagreeable than the downward 'movement of the body, and' insuiicient to withstand the shock and there-tf fore at such time the auxiliary spring 29 is brought into play andcompressed-between .the flange 25 and the upper head end of the casing. In the reb ound,the spring 30 comes into play, having been previously compressed against the iange 25 by means of the plate 2 and nut 9.' On. the downward thrust of the body the spring 30 is relieved, and on the rebound it vwill be compressed again to its former tension therefore eiiecting a check on the violent rebound of the body. The bolt'8 is therefore only lsubject to the stresses'necessary to keep the spring 30 Conveniently compressed and acts to compress said springagain on the upward movement Aof the body after being relieved on the downward, movement of said body. i

It will further be seen that the spring seat or cup 24 is suspended by the bolts 12, which are in turn supported by the axle spring 17, and the cup or seat 24 in turn supports the inner shock absorbing spring 29, while thel bottom plate '2' which supports the spring 30 is in turn supported by the centrally located bolt 48, the latter serving to take the stress of the spring 30 as the latter checks Athe -body of the ve icle and its load.

Itr will be .noted thatthe nut 9 bea-rs against the bottom'of the plate 2 and is free to project through an opening 31 in the bottom head 2, corresponding in shape to the nut 9 so as to prevent said nut from getting loose. -When the check'spring 30 is prima rily compressed, the bottom head is removed,

and after adjusting the tension of the spring -30 saidhead is rep aced and fastened by the tie bolts 6, the bottom head 2.theny serving as alock for the nut 9. f In Fig. 5 I have illustrated another arrangement of springstand spring seat. Re-

.ferringto said figure it will be noted that the cup shaped spring seat 24 is inverted as compared with the arrangement shown in Figs.2 and 3, the sprin 28 'being interposed between the top o the member 24 and the upper head l of the casing while the' spring 29 surrounds the suspension bolts 21', one end of said spring bearin against the head 1 and the opposite en of said spring bearing against thc iiange 25 of said cup shaped seat. The spring 30 is arranged within the seat `and bears at 'its lower end -against the bottom plate 2b. It will also be noted' that the suspension bolts 21 pass through the top wall of the cup shaped seat 24 and the heads 23of said bolts are turned inwardly toward each other.v The operation of the shock absorber illustrated in Fig. 5 is on the same principle'as that shown, in Figs. 2 and 3 the only difference being in a rearrangement of the main and auxiliary springs which sustain the load and shocks, and the check spring which cushions the re bound.

It, will be understood that the diameter of the casing and its springs, as well as the number of convolutions in the springs, may be increased or diminished in accordance with the weight of the load, and any desired connected to said seat and passing through bpenings in the frame, a rebound absorbing spring acting aasinst the other head in opposition to the tmentioned spring, means for connectingsaid frame to a vehicle, and means for connecting said boltsl to a rela tively movable part of the vehicle whereby. the spring is adapted to absorb road shocks of the wheels and prevent the transmission of the same to the vvehicle body.

2. A shock absorber comprising a frame embodying oppositely located heads, a cup shaped spring seat movable back and forth between said heads, a bottom plate also movable back and forth between said heads, suspending means eonnecting said bottom plate with the upper head, a coiled spring arranged in said seat and bearing against one of the heads of the frame, sliding suspension bolts connected to said seat and passin through openings in the frame, a ehee4 spring interposed between said seat and bottom plate, means for connecting said frame to a vehicle, and means for connecting said bolts to a relatively movable part of the vehicle, whereby the spring is adapted to absorb road shocks of the wheels and prevent the transmission of the same to the vehicle body.

3. A shock absorber comprising a frame embodying oppositely located heads, a cup shaped spring seat movable back and `forth between said heads, a coiled spring arranged in said seat and bearing against one of the heads of the frame, sliding suspension bolts connected to said seatand passing through openings in the frame, means for connecting said frame to a vehicle, means for connecting said bolts to a relatively movable 'part' of the vehicle, whereby the spring is adapted to absorb road shocks of the wheels and prevent the transmission of the same to the vehicle body, a shell or casing surrounding and inclosing said springseat and interposed between said heads, and tie bolts fastniig the top and bot-tom heads against said siel. l

4. A shock absorber comprisnga'cylindrical casing embodying oppositely `arranged heads, 'a cylindrical shell interposed between. the heads, a centrally arranged supportingbolt connected to the upper head, a bottom plate supported bysaid bolt, suspension bolts slidable through openings in oneof the heads, a cup shaped spring seat supported by said suspension bolts and slidable therewith, acoiled spring having one end bearing against said seat and the other end againstone of the easingheads,` a check spring bearing against and acting to resist the upward movement of said bottom plate, blocks carried by the outer projectin ends of said bolts, and attaching bolts carriedby said blocks and the frame of the shock absorber adapting the relatively movable parts of thel shock absorber to be secured to relatively movable parts of a vehicle.

In testimony whereof I'alx my signature in presence of two witnesses.

CHARLES F. BOIDOT.

Witnesses:

' lANDREW CATELAE, .NE1L H. DoNN E'rroN.

' @epica et this patent may be obtained for .five cents each, by addressing the Commissioner o! Patenti, Washington, D. C." u 

